Preparation method for titanium-based amorphous spherical powder

Abstract

Disclosed is a preparation method for titanium-based amorphous spherical powder, including treating a titanium-based brazing filler metal by means of plasma rotating electrode process (PREP) atomization, where argon and helium are used as a protective gas for the PREP atomization. According to this solution, PREP atomization is used, and argon and helium are used in combination as a protective gas, thereby effectively increasing the cooling velocity required by titanium-based amorphous powder that can be achieved in this process and thus significantly improving the preparation success rate and purity of the titanium-based amorphous powder. The applicant finds that when argon and helium are used in combination as a protective gas, the thermal conductivity coefficient of the mixed gas is effectively improved, such that that the cooling rate is increased, and the success rate of preparing the titanium-based amorphous spherical powder by means of PREP atomization is fully improved.

What is claimed is: 
     
         1 . A preparation method for titanium-based amorphous spherical powder, comprising treating a titanium-based brazing filler metal by means of plasma rotating electrode process (PREP) atomization, wherein argon and helium are used as a protective gas for the PREP atomization. 
     
     
         2 . The preparation method for titanium-based amorphous spherical powder according to  claim 1 , wherein a concentration of argon in the protective gas is 10-50%. 
     
     
         3 . The preparation method for titanium-based amorphous spherical powder according to  claim 2 , wherein gas atomization of the titanium-based brazing filler metal is specifically completed in a box body, and the argon and helium are mixed before being filled into the box body. 
     
     
         4 . The preparation method for titanium-based amorphous spherical powder according to  claim 3 , wherein the titanium-based brazing filler metal is a bar material with a diameter of 60-90 mm. 
     
     
         5 . The preparation method for titanium-based amorphous spherical powder according to  claim 4 , wherein a rotation velocity of the bar material for the PREP atomization is greater than 25500 rpm. 
     
     
         6 . The preparation method for titanium-based amorphous spherical powder according to  claim 4 , wherein a linear velocity of the bar material for the PREP atomization is greater than 80 m/s. 
     
     
         7 . The preparation method for titanium-based amorphous spherical powder according to  claim 6 , wherein the titanium-based brazing filler metal comprises Ti, Zr and M, where the M is a combination of two or three of Cu, Ni, Be, Ag, Sn, Si, Hf and Al, and a relative melting point offset J of the titanium-based alloy is ≥0.2. 
     
     
         8 . The preparation method for titanium-based amorphous spherical powder according to  claim 7 , wherein a total mass percentage of Ti and Zr in the titanium-based brazing filler metal is greater than 50%.